scholarly journals Plutonium Isotopes Concentration in Seawater along the Algerian Coast

2007 ◽  
Vol 2007 ◽  
pp. 1-5
Author(s):  
M. Benkrid ◽  
A. Noureddine
Keyword(s):  
Alpha Spectrometry ◽  
Mediterranean Area ◽  
Energy Agency ◽  
Plutonium Isotopes ◽  
Vacuum Filtration ◽  
Water Sampler ◽  
Regional Project ◽  
Algerian Coast ◽  
Seawater Samples ◽  
Environment Parameters

The International Atomic Energy Agency has organised in the framework of the regional project RAF/7/004, in collaboration with “Commissariat à l'Energie Atomique” (COMENA) and “Institut des Sciences de la Mer et de l'Aménagement du Littoral” (ISMAL), during August 2001, a scientific campaign along the Algerian coast, on board of the research vessel M.S. Benyahia of ISMAL is. Three stations, at the centre, east and west, were selected to collect five seawater samples for each water column reaching a maximum depth of 2000 m, using a stainless-steel water sampler of a volume of 250 litres. After recording the marine environment parameters (temperature and conductivity), seawater samples were conditioned and preconcentrated to precipitate plutonium isotopes usingMnCl2in the form ofMnO2in order to proceed to plutonium extraction by radiochemical separation and prepare the source by coprecipitation using neodymium fluoride (NdF3) by vacuum filtration and an evaluation of the activity by alpha spectrometry. Concentration results in units ofμBq/l of plutonium isotopes were obtained in the range of 6.7±1.00 to 25.5±3.70 forP239+240uand 0.21±0.04 to 0.77±0.15 forP238u. Distribution of Pu through the plot of its profile was studied and the concentration was estimated. The obtained results were compared toC137sand those found by other authors in the same Mediterranean area.

scholarly journals Distribution of Natural Radioactivity,137Cs,90Sr, and Plutonium Isotopes in a Water Column and Sediment Core along the Algerian Coast

2007 ◽  
Vol 2007 ◽  
pp. 1-6 ◽  
Author(s):  
A. Noureddine ◽  
M. Benkrid ◽  
R. Maoui ◽  
M. Menacer ◽  
R. Boudjenoun
Keyword(s):  
Water Column ◽  
Sediment Core ◽  
Sediment Cores ◽  
Dry Weight ◽  
Artificial Radioactivity ◽  
Energy Agency ◽  
Area Of Interest ◽  
Algerian Coast ◽  
Seawater Samples ◽  
Thorium Series

Concentrations of natural (40K,210Pb, uranium, and thorium series) and artificial radioelements (137Cs,90Sr,239+240Pu) were determined in seawater and sediment samples collected from stations along the Algerian coast. Seawater was collected from the surface to a maximum depth of 2000 m; the sediment cores were sampled from a depth of around 1500 m. This work was carried out in August 2001, in the framework of the Regional African project /7/004 (RAF), by the accomplishment of an oceanographic campaign organized by the International Atomic Energy Agency (IAEA) in collaboration with Commissariat à l'Energie Atomique (COMENA) and L'Institut des Sciences de la Mer et de L'Amenagement du Littoral (ISMAL), on board of the research vessel of M.S. Benyahia of ISMAL. In addition to the record of the conductivity (mS) and temperature (°C) data at each station, seawater samples were treated and preconcentrated on board, those of sediment cores were divided into different layers in order to undergo analyses in the laboratory of radiological impact studies of Algiers. Concentration results were obtained for137Cs and90Sr in mBq/L and239+240Pu inμBq/L in seawater, and also for natural and artificial radionuclides in Bq/kg dry weight in the layers of the sediment cores. The different profiles of137Cs,239+240Pu,90Sr, and210Pb concentrations against depth were presented to show artificial radioactivity distribution in the water column and sediment core. Concentrations of137Cs in the sediment core were also used to identify the137Cs peak in the area of interest.

Determination of plutonium isotopes in seawater samples by Semiconductor Alpha Spectrometry, ICP-MS and AMS techniques

2009 ◽  
Vol 282 (3) ◽  
pp. 831-835 ◽  
Author(s):  
S. H. Lee ◽  
P. P. Povinec ◽  
J. Gastaud ◽  
J. J. La Rosa ◽  
E. Wyse ◽  
...  
Keyword(s):  
Alpha Spectrometry ◽  
Plutonium Isotopes ◽  
Icp Ms ◽  
Seawater Samples

Simultaneous determination of uranium and plutonium isotopes in soils by means of single alpha-spectrometry

1979 ◽  
Vol 52 (1) ◽  
pp. 133-142 ◽  
Author(s):  
T. Hashimoto ◽  
K. Taniguchi ◽  
H. Sugiyama ◽  
T. Sotobayashi
Keyword(s):  
Simultaneous Determination ◽  
Alpha Spectrometry ◽  
Plutonium Isotopes

Determination of 234U and 238U in seawater samples by alpha spectrometry after concentration of U(VI) onto hydrotalcite and co-precipitation with LaF3

2013 ◽  
Vol 101 (10) ◽  
pp. 621-624
Author(s):  
N. V. Suc ◽  
T. T. Bich
Keyword(s):  
Inductively Coupled Plasma ◽  
Alpha Spectrometry ◽  
Separation Efficiency ◽  
Chemical Separation ◽  
Accurate Method ◽  
Uranium Isotopes ◽  
Inductively Coupled ◽  
Seawater Samples ◽  
Co Precipitation

Summary This paper presents a simple and accurate method for determination of uranium isotopes (234U and 238U) in seawater samples using alpha spectrometry. Uranium is pre-concentrated from seawater samples via adsorption on hydrotalcite at pH 6.5. The absorbent is dissolved into 50 ml of 8M HNO3; then filtered through a Dowex-1 column. U(VI) in the elution solution is reduced to U(IV) using zinc metal in 4M solution of HCl and then co-precipitated with LaF3. The chemical separation efficiency is found to be 97.12±2.68%, eliminating the need of using 232U tracer in other published methods. This method is validated via comparison with results obtained using inductively coupled plasma mass spectrometry (ICP-MS) and neutron activation analysis (NAA) for three seawater samples.

A comparison of different radiochemical methods applicable for the determination of plutonium isotopes in urine via alpha spectrometry

2006 ◽  
Vol 56 (1) ◽  
pp. D265-D270 ◽  
Author(s):  
I. Giardina ◽  
L. Andreocci ◽  
S. Bazzarri ◽  
L. Mancini ◽  
P. Battisti
Keyword(s):  
Alpha Spectrometry ◽  
Plutonium Isotopes ◽  
Radiochemical Methods

A comparison of different radiochemical methods applicable for the determination of plutonium isotopes in urine via alpha spectrometry

2006 ◽  
Vol 56 (S4) ◽  
pp. D265-D270 ◽  
Author(s):  
I. Giardina ◽  
L. Andreocci ◽  
S. Bazzarri ◽  
L. Mancini ◽  
P. Battisti
Keyword(s):  
Alpha Spectrometry ◽  
Plutonium Isotopes ◽  
Radiochemical Methods

scholarly journals Validation of the method for determination of plutonium isotopes in urine samples and its application in a nuclear facility at Otwock

Nukleonika ◽  
2015 ◽  
Vol 60 (1) ◽  
pp. 181-186 ◽  
Author(s):  
Katarzyna Rzemek ◽  
Andrzej Czerwiński ◽  
Małgorzata Dymecka ◽  
Jakub Ośko ◽  
Tomasz Pliszczyński ◽  
...  
Keyword(s):  
Human Health ◽  
Alpha Spectrometry ◽  
Nuclear Research ◽  
Urine Samples ◽  
Radioactive Elements ◽  
Nuclear Facility ◽  
Plutonium Isotopes ◽  
Internal Contamination ◽  
National Centre

Abstract The studies aimed at determining low activities of alpha radioactive elements are widely recognized as essential for the human health, because of their high radiotoxicity in case of internal contamination. Some groups of workers of nuclear facility at Otwock are potentially exposed to contamination with plutonium isotopes. For this reason, the method for determination of plutonium isotopes has been introduced and validated in Radiation Protection Measurements Laboratory (LPD) of the National Centre for Nuclear Research (NCBJ). In this method the plutonium is isolated from a sample by coprecipitation with phosphates and separated on a AG 1-X2 Resin. After electrodeposition, the sample is measured by alpha spectrometry. Validation was performed in order to assess parameters such as: selectivity, accuracy (trueness and precision) and linearity of the method. The results of plutonium determination in urine samples of persons potentially exposed to internal contamination are presented in this work.

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